I've been having this exact same problem,I invited a family member and when he tries to use the chromecast it prompts "Not available" when selecting the device in the room. When going into settings it's the same issue.

If you have a wireless router that creates two networks with the same SSID (name) but different frequencies (eg. 2.4GHZ and 5GHZ), Home devices seem to have problems here, even they’re on the same logical network.

My phone and at least one Google home (due to distance, stronger signal, etc) would connect to my 2.4, while others would connect to the 5 because they were closer. They would however show as “limited” in the home app.

I solved the problem by disabling the 2.4 and now all devices connect to the same radio and appear in app. Another solution would be to name the frequencies differently (eg. Wifi 2.4 and Wifi 5) then explicitly set your home devices to one specific access point. They should all appear in app, provided you me phone connects to the same access point as well.

If you have something like a mesh network or range extender however, I’m not sure this will provide a solution as the radios will still be different. Hope you find this useful. Cheers

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